Android如何监听输入框的出现和隐藏

类实现：

  public SoftKeyboardState(Activity activity) {    this.decorView = activity.findViewById(android.R.id.content);    initKeyboardListener();  }  private void initKeyboardListener() {    decorView.getViewTreeObserver().addOnGlobalLayoutListener(      new ViewTreeObserver.OnGlobalLayoutListener(){        private final Rect windowVisibleDisplayFrame = new Rect();        private int lastVisibleDecorViewHeight;        @Override        public void onGlobalLayout() {          decorView.getWindowVisibleDisplayFrame(windowVisibleDisplayFrame);          final int visibleDecorViewHeight = windowVisibleDisplayFrame.height();          Log.i(TAG,"  onGlobalLayout called " + visibleDecorViewHeight+ "  "+ lastVisibleDecorViewHeight);          if (lastVisibleDecorViewHeight != 0) {            if (lastVisibleDecorViewHeight - visibleDecorViewHeight > 200) {              if (listener != null)listener.onKeyboardStateChanged(true);            } else if (visibleDecorViewHeight - lastVisibleDecorViewHeight > 200) {              if (listener != null)listener.onKeyboardStateChanged(false);            }          }          lastVisibleDecorViewHeight = visibleDecorViewHeight;        }      });  }  public void setOnKeyboardStateChangedListener(OnKeyboardStateChangedListener listener) {    this.listener = listener;  }  public interface OnKeyboardStateChangedListener {     void onKeyboardStateChanged(boolean isShown);  }}

注意以上类只能监听普通的activity，如果theme中有如下设置，会不生效：

        true

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